Update Dockerfile

Dockerfile

@@ -8,14 +8,11 @@ COPY . .
 RUN apt-get update \
     && apt-get -y install ffmpeg
 
-# Set the working directory to /
-WORKDIR /
+# Change to backend as working directory
+WORKDIR "/backend"
 
 # Install requirements.txt 
-RUN pip install --no-cache-dir --upgrade -r backend/requirements.txt
-
-# Change to backend directory
-WORKDIR "/backend"
+RUN pip install --no-cache-dir --upgrade -r /requirements.txt
 
 # Start the FastAPI app on port 7860, the default port expected by Spaces
 CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]